Can you provide an example of use or some documentation?

Hi, I need to add exactly this feature to a client module I am developing but I haven't found any documentation or examples in the modules.

What I need is to reload some javascript behaviors in a callback call for a node creation form with CCK and some js, like date_popup and file uploads.

I've figured that the ahah response module is called in the callback function, but not sure of how to call it, maybe like this?

Instead of

   drupal_json(array(
    'status'   => TRUE,
    'data'     => theme('status_messages') . drupal_render($changed_elements),
    'settings' => call_user_func_array('array_merge_recursive', $javascript['setting']),
  ));   

I think this should be placed:

$content = array(    'status'   => TRUE,
    'data'     => theme('status_messages') . drupal_render($changed_elements),
    'settings' => call_user_func_array('array_merge_recursive', $javascript['setting']),);
print theme('ahah_response', $content);

but when it comes to force the js add I am totally clueless, could you please clarify the usage of these modules to me?

Thanks!